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(11) | EP 0 700 171 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Echo canceller coefficient adaptation |
| (57) An echo canceller (30) cancels an echo signal produced on a transmission path (14)
on the basis of a received signal received through a reception path (15). The echo
canceller comprises an adaptive filter (31) for producing a pseudo-echo signal from
the received signal in accordance with tap gains. A producing section (19, 20) produces
an error signal representative of an error level between the echo signal and the pseudo-echo
signal. A supplying section (21, 32) supplies the adaptive filter with selected ones
of the tap gains memorized in a memory section (18) when the error level is less than
a predetermined threshold level. The adaptive filter renews the selected ones of the
tap gains into renewal tap gains in accordance with the received signal and the error
signal to store the renewal tap gains as the selected ones of the tap gains in the
memory section. |